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Prompt fission γ -ray spectrum characteristics from Pu240(sf) and Pu242(sf)

May 4, 2016
6 pages
Published in:
  • Phys.Rev.C 93 (2016) 5, 054603
  • Published: May 4, 2016
DOI:
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Abstract: (APS)
In this paper we present first results for prompt fission γ-ray spectra (PFGS) characteristics from the spontaneous fission (sf) of Pu240 and Pu242. For Pu242(sf) we obtained, after proper unfolding of the detector response, an average energy per photon ε¯γ=(0.843±0.012) MeV, an average multiplicity M¯γ=(6.72±0.07), and an average total γ-ray energy release per fission E¯γ,tot = (5.66 ± 0.06) MeV. The Pu240(sf) emission spectrum was obtained by applying a so-called detector-response transformation function determined from the Pu242 spectrum measured in exactly the same geometry. The results are an average energy per photon ε¯γ=(0.80±0.07) MeV, the average multiplicity M¯γ = (8.2 ± 0.4), and an average total γ-ray energy release per fission E¯γ,tot = (6.6 ± 0.5) MeV. The PFGS characteristics for Pu242(sf) are in very good agreement with those from thermal-neutron-induced fission on Pu241 and scales well with the corresponding prompt neutron multiplicity. Our results in the case of Pu240(sf), although drawn from a limited number of events, show a significantly enhanced average multiplicity and average total energy, but may be understood from a different fragment yield distribution in Pu240(sf) compared to that of Pu242(sf).